http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
비등방성 복합적층판 및 쉘의 고차전단변형을 고려한 비감쇄 동적응답
윤석호,한성천,장석윤,Yoon, Seok Ho,Han, Seong Cheon,Chang, Suk Yoon 한국강구조학회 1997 韓國鋼構造學會 論文集 Vol.9 No.3
This paper will expand the third-order shear deformation theory by the double-Fourier series and reduce to the solution of a system of ordinary differential equations in time, which are integrated numerically using Newmark's direct integration method and clarify the undamped dynamic responses for the cross-ply and antisymmetric angle-ply laminated composite plates and shells with simply supported boundary condition. Numerical results for deflections are presented showing the effect of side-to-thickness ratio, aspect ratio, material anisotropy, and lamination scheme. 본 연구에서는 복합재료로 구성된 복합적층판 및 쉘에 대하여 3차 전단 변형이론을 이용한 변위를 가정하여 단순지지 경계조건을 만족하는 변위형상함수를 퓨리예급수로 전개하고 동적 평형 방정식을 유도하여 뉴마크의 수치적분법을 사용하여 단면특성계수, 재료의 특성, 층의 배열에 따른 복합적층판 및 쉘의 비감쇄 동적응답특성을 연구하였다.
윤석호,한성천,장석윤,Yoon, Seok Ho,Han, Sung Cheon,Chang, Suk Yoon 한국강구조학회 2001 韓國鋼構造學會 論文集 Vol.13 No.1
본 연구에서는 복합재료로 구성된 구조물로서 박스거더와 같이 임의의 각도로 연결된 절판을 유한대판법으로 해석하였다. 각 적층판의 강성으로부터 적분에 의하여 판두께 방향의 전체 강성을 구하고 최소 포텐샬 에너지 이론으로부터 구한 평형방정식에 대입하여 전체 강성매트릭스를 구하였다. 슬래브나 박스거더의 변위 함수는 횡 방향의 Hermite 다항식과 종 방향의 조화함수의 결합으로 가정하였다. 종 방향 조화함수는 단부의 경계조건을 만족시키는 함수를 사용하였다. 해석시간의 단축 및 모델링이 쉽다는 장점을 가진 유한대판법은 복합적층 재료로 구성된 박스거더와 같은 절판해석의 경우에도 매우 정확한 해를 얻을 수 있다. In this paper the analysis of laminate composite folded plates with arbitrary angle connection like box girder is studied by finite strip method Total stiffness of laminated plate is obtained by integration of the stiffness in each layer or lamina through laminate thickness and total stiffness in each layer or lamina through laminate thickness and total tiffness matrix is obtained by substitutionto equilibrium equation derived from the minimum total potential energy theorem. The assumed displacement functions for a finite strip method in plate or box girder analysis are combinations of one-way polynomial functions in the transverse direction and harmonic functions in the span-wise direction. Finite strip method with the merits of the simplification in modeling and the reduction of analytical time is accurate in the analysis of laminate composite folded plates shaped like box firders.
윤석호(Yoon, Suk-ho) 연세대학교 강진다산실학연구원 2019 다산과현대 Vol.12 No.-
사환기의 다산은 전업에 기초한 ‘농자득전’을 삼대 토지제도의 이상적 원리로 제시했다. 하지만 『맹자집주』의 고법 이해를 따랐던 까닭에, ‘농자득전’의 고법을 삼대 전역에서 해명하지는 못했다. 유배기의 다산은 여러 경전을 탐구하고 통섭하는 가운데, 몇 번의 단계를 거쳐 ‘농자득전’의 고법적 양상을 삼대 전역에서 논증해갔다. 먼저 정지가 시행된 時空을 삼대 전역으로 확대했고[삼대정지론], 이어 모든 정지에 공전이 설치되었다고 보았으며[일원적 삼대공전론], 마지막으로는 10구법과 정지를 구분하여 양자가 각기 권역을 달리해 기내에서 시행되었다고 보았다.[이원적 삼대공전론] 이같은 과정 속에서 다산은 3경과 『주례』를 중심으로 4서를 통섭 및 재해석했다. 그리고 공전을 삼대의 보편적이고도 핵심적인 제도로 간주했다. This article aims to argue the course of understanding about the Three Periods"s land system. In Jeonron(〈田論〉, 1798)”, he proposed Land-to-the-Tiller Principle(農者得田) as the ideology of the Three Periods"s land system under nine consecutive jobs. However, he could not explain the principle under Old Law(古法) because his method of understanding old law was based on the Collected Commentaries on the Book of Mencius(『孟子集註』), which regarded Nine-square Field(井田) as a partial land system of Three Periods. Dasan explored the Three Periods ruling system and its Old Law(古法) during his exile period(1800-1818), and constantly modified and supplemented the viewpoint of the period of official career. It can be broadly divided into three stages. The first was the Samdae Jungjiron(三代井地論), which regarded the Nine-square Field(井田) as a section of the whole area of the Three Periods Land by breaking away from the way of understanding Nine-square Field(井田) of Collected Commentaries on the Book of Mencius(『孟子集註』). However, he maintained the Classical style of Mencius(『孟子』), which matched Gongjeon(公田) with Jobeob(助法). The second stage was a One-way Samdaegingjeonron(一元的三代公田論) which considered Gongjeon(公田) was installed inwhole agricultural land of Three Periods. This opinion couldbe made by breaking away from the Classical style ofMencius(『孟子』), which matched Gongjeon(公田) with Jobeob(助法). As a result, the ideology of Bunjeon(分田) and Jerock(制祿) could be specifically proved through the Old Law(古法) of Gongjeon(公田). The third stage was Two-way Samdaegingjeonron(二元的 三代公田論), which means that although Gongjeon(公田) was installed around the whole agricultural area of Three Periods, the division method was different from the Ten-square Field(10溝法) and the Nine-square Field(井田). In particular, Dasan studied Zhou-li(『周禮』) in earnest under the Two-ways Samdaegingjeonron(二元的 三代公田論), and through this he regarded Gongjeon(公田) as the key law of the ruling system including the land system.
전단변형을 고려한 비등방성 적층판의 기하학적 비선형 처짐 해석
윤석호(Seok Ho Yoon),장석윤(Suk Yoon Chang) 한국강구조학회 1993 韓國鋼構造學會誌 Vol.5 No.1
Laminated composite plates exhibit properties different from those of single-layer plate. In addition, the great difference in elastic properties between fiber and matrix materials leads to a high ratio of in-plane Young`s modulus to transverse shear modulus for laminated composite plates. It results in the fact that the classical theory of plates, based on neglecting transverse shear deformation, is invalid for laminated composite plates. Thus, to obtain the more exact behavior of laminated composite plates, considering a effects of shear deformation and geometrical nonlinear should be considered in the analysis of them. The finite difference technique is used to analyze laminated composite rectangular plates in geometrical nonlinear problem as well as linear problem. The algorithm in this study is the Newton-Raphson iteration method. From the numerical results, it is clarified that the effects of transverse shear deformation and coupling between stretching and bending due to variation of ply-angle are quite significant components for small ratio of side length to thickness.
부분 등분포 단부 모멘트 하중을 받는 직교 이방성 판의 해석
윤석호(Suk Ho Yoon),박원태(Weon Tae Park),장석윤(Suk Yoon Chang) 한국강구조학회 1991 韓國鋼構造學會誌 Vol.3 No.1
This paper presents an analytical solution for the bending moments and shearing forces of an orthotropic half-infinite plates under partial-uniform moment load acting along the free edge. The solution satisfies the equilibrium and compatibility equations concurrently. All the equations for orthotropy must be degenerated into the expressions for isotropy when orthotropic constants are replaced by isotropic ones. The author has evaluated all the equations of orthotropy and succeeded in obtaining exactly identical expressions to the equations of isotropy which were derived independently by means of L`hospital`s rule. The formal solution is expressed in terms of closed form. The orthotropic constants are evaluated for one kind and two different orientations of the grain of wood. The numerical results for orthotropy are evaluated one kind and two different orientations of three-layered plywood. The distribution of bending moments and shearing forces are shown in figures. It is noted that the distribution of bending moments and shearing forces of orthotropic plate depends on the type of materials and orientations of the grain.